Select a variable to represent one quantity and state what that variable represents. Express the second quantity in terms of
the variable selected.
-The average time it takes to get through a check-out line at a large wholesale club is 12 minutes more than 4 times the time it takes to get through a check-out line at a small grocery store, s.
A) let s = time at small store, then 12s + 4 = time at large club
B) let s = time at small store, then 12·4 + s = time at large club
C) let s = time at small store, then (12 + 4)s = time at large club
D) let s = time at small store, then 4s + 12 = time at large club

Question

Quizplus · Accepted Answer

The problem states that the average time at the large wholesale club is 12 minutes more than 4 times the time at the small grocery store. This means that we can represent the time at the small store with the variable s. Therefore, the time at the large club would be 4 times s, which is 4s, plus 12 minutes. So, we get the equation: time at large club = 4s + 12. This matches option D. The problem states that the average time at the large wholesale club is 12 minutes more than 4 times the time at the small grocery store. Therefore, we can let s be the time it takes to get through a check-out line at the small grocery store. Then, the time at the large club is 4 times s plus 12, or 4s + 12. Therefore, choice D, "let s = time at small store, then 4s + 12 = time at large club," is the best choice.

Select a Variable to Represent One Quantity and State What